Proceedings of the 11th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management, 2019
Evaluating the performance of information systems (ISs) has emerged from the increasing influence... more Evaluating the performance of information systems (ISs) has emerged from the increasing influence of information technology on the effectiveness and efficiency of work processes in an organization . The aim of the overall study is to overcome a lack in the literature regarding the assessment of information systems (IS) in Libyan Higher Education (LHE), especially universities. The aim of this initial article is to focus on the University of Tripoli (UOT), a study that will be extended to other Libyan public universities. A description of the study, its significance and objectives and the methodology followed are presented, together with an analysis of the findings on the basis of appropriately chosen models. Finally, we assess the current level of ISs implemented in UOT by analyzing the findings based on these models.
This article presents a game theoretic model of parental care which models the feedback between p... more This article presents a game theoretic model of parental care which models the feedback between patterns of care and the operational sex ratio. It is assumed here that males can be in one of two states: searching for a mate or breeding (including caring for their offspring). Females can be in one of three states: receptive (searching), non-receptive or breeding. However, these sets of states can be adapted to the physiology of a particular species. The length of time an individual remains in the breeding state depends on the level of care an individual gives. When in the searching state, individuals find partners at a rate dependent on the proportion of members of the opposite sex searching. These rates are defined to satisfy the Fisher condition that the total number of offspring of males equals the total number of offspring of females. The operational sex ratio is not defined exogenously, but can be derived from the adult sex ratio and the pattern of parental care. Pure strategy profiles and so called single sex stable polymorphisms, in which behaviour is varied within one sex, are derived analytically. The difference between mixed evolutionarily stable strategies and stable polymorphisms within this framework is highlighted. The effect of various physiological and demographic parameters on patterns of care are considered.
Our study aimed at elucidating which genetic alterations tend to form a network and could be appl... more Our study aimed at elucidating which genetic alterations tend to form a network and could be applied as molecular markers of larynx squamous cell carcinoma (LSCC). A panel of genes involved in tumorigenesis was investigated. To search for the possible mechanisms of gene silencing, loss of heterozygosity (LOH) was analysed followed by testing DNA methylation and protein expression for those genes found with the highest frequency of LOH (CDKN2A (55.4%), MLH1 (46.0%), RB1 (35.7%)). A correlation of both LOH and hypermethylation with the loss of expression for CDKN2A and MLH1 was found. Disrupted Rb pathway (loss of expression of RB1 and/or of CDKN2A) in 55.9% of analysed cases confirmed the hypothesis that RB1 pathway is altered in head and neck squamous cell carcinomas, with CDKN2A (45%), rather than RB1 (11.8%) being more frequently inactivated. In LSCC, LOH tends to occur together in gene pairs or triplets. The pair MLH1/CDKN2A and triplets MLH1/TSG on 8p22/CDKN2A and MLH1/ CDKN2A/RB1 are related to staging and grading. LOH in MLH1 correlates with lower and LOH in CDKN2A with higher grades of LSCC. It can be concluded that MLH1 and CDKN2A play an important role in LSCC development and progression.
Nowadays, consumers can find basic information about a wide range of offers with almost no effort... more Nowadays, consumers can find basic information about a wide range of offers with almost no effort. For example, Internet sites give information about secondhand cars regarding the mark, age, price, engine type/size and distance travelled. This information suffices to assess whether a car is potentially attractive, but is not sufficient to make a final decision. The authors have developed an automatic procedure for selecting a shortlist of offers that aims to maximize a weighted average of the attractiveness and diversity of the offers on the shortlist. The consumer determines the number of offers to be placed on the shortlist and the relative importance of the traits considered. The authors have compared the results obtained by applying two methods of multicriteria assessment.
Although studies using experimental game theory have been carried out in various countries, no su... more Although studies using experimental game theory have been carried out in various countries, no such major study has occurred in Poland. The study described here aims to investigate generalized trust and reciprocation among Polish students. In the literature, these traits are seen to be positively correlated with economic growth. Poland is regarded as the most successful post-soviet bloc country in transforming to a market economy, but the level of generalized trust compared to other post-communist countries is reported to be low. This study aims to see to what degree this reported level of generalized trust is visible amongst young Poles via experimental game theory, along with a questionnaire. The three games to be played are described. Bayesian equilibria illustrating behaviour observed in previous studies are derived for two of these games and the experimental procedure is described.
This article presents a model of searching for some resource, e.g. a job, whose value depends on ... more This article presents a model of searching for some resource, e.g. a job, whose value depends on two quantitative traits. The decision maker observes offers in a random order and must accept precisely one offer. Recall of previously observed offers is not possible. It is assumed that the value of an offer is a linear function of these two traits, which come from a bivariate normal distribution. We consider the following four strategy sets: i) the decision on whether to accept an offer is based purely on the first trait, ii) any decision is only made after observing both traits, iii) after observing the first trait, the decision maker can either immediately accept, immediately reject or observe the second trait and then decide, iv) after observing the first trait, the decision maker can either immediately reject or observe the second trait and then decide. The goal of the decision maker is to maximize his expected reward, where the reward is equal to the value of the offer selected m...
Artykuł prezentuje wyniki badań eksperymentalnych nad wybranymi aspektami kapitału społecznego w ... more Artykuł prezentuje wyniki badań eksperymentalnych nad wybranymi aspektami kapitału społecznego w Polsce na tle innych państw. Analizowane są w nim aspekty: zaufania i wiarygodności. W artykule porównano wyniki badań opartych na typowej grę eksperymentalną (grę „zaufanie”), w tym polskie badania autorów przeprowadzone na grupie 1540 studentów w 16 miastach – stolicach regionów Polski. Wyniki badań wskazują, że względem proporcji pieniędzy oddanych przez gracza B (miara wiarygodności), Polacy (oraz ogólnie mieszkańcy Europy Centralnej/Wschodniej) nie różnią od osób z kultury zachodniej (Oceania, Europa Zachodnia, Ameryka Północna). Biorąc pod uwagę proporcję pieniędzy przekazanych przez gracza A (miara zaufania), istnieją słabe tylko dowody, że Polacy przekazują mniejszą część (czyli są mniej ufni) niż pozostali Europejczycy.
Road transport causes one fifth of the EU's total emissions of carbon dioxide (CO2), which are es... more Road transport causes one fifth of the EU's total emissions of carbon dioxide (CO2), which are especially high in cities. A suggested solution to this situation is the introduction of electric vehicles (EV). However, evidence from European countries shows that, without any governmental support, the sales of EVs are low in comparison to other vehicles. Our pilot study, conducted in Wrocław (Poland), shows that car purchasers in Poland are aware of the difference between pure electric and hybrid vehicles (HEVs). As most car purchasers buy on the secondhand market, the potential for sales of EVs and HEVs still seems limited. Our study confirmed that consumers have a generally positive opinion about EVs. However, they expect that the purchase of EVs should be subsidized. c
Acta Universitatis Lodziensis. Folia Oeconomica, 2016
Norms of reciprocity and the level of generalised trust are components of the social capital of a... more Norms of reciprocity and the level of generalised trust are components of the social capital of a society, which is argued to be associated with economic growth. This article presents results from a large scale study of Polish students based on the Trust Game, in which an initiator and respondent can obtain mutual benefits when the initiator exhibits trust in the respondent, who then expresses positive reciprocity. Based on these results, we investigate norms of positive reciprocation within the Polish student community. Analysis indicates that a large proportion of students seem to use one of four simple norms of reciprocation. In statistical terms, the level of reciprocation is rather well reflected in the expectations of the initiators.
We consider a steady state model of mutual mate choice in which an individuals mate preferences ... more We consider a steady state model of mutual mate choice in which an individuals mate preferences depend on his/her age, and the preferences are over the ages of prospective mates of the opposite sex. We present both a discrete time (and age) model and a continuous time (and age) model. In the discrete time model males are fertile for m periods and females for n m periods, which is all that distinguishes the sexes. Although we can deal with arbitrary preferences, we concentrate on a simple fertility model where the common utility to a male age i and female age j who mate is the number K = min (m i+ 1; n j + 1) of future periods of joint fertility. The incoming sex ratio R of age 1 males to age 1 females is given exogenously. In each period individuals are randomly (non assortatively) matched and form a mated couple by mutual consent; otherwise they go into the next period unmated and older. We derive properties of equilibrium threshold acceptance strategies and establish the existence of invariant age distributions. This extends earlier models of mutual choice with one dimensional types of Alpern and Reyniers [1999, J. Theo.. Biol. 198, 71-88; 2005 J. Theo.. Biol 237 337-354] where individuals sought, respectively, individuals with similar or high types. In the more technical continuous time model, individuals are randomly matched at times given by a Poisson process. We determine the equilibrium threshold acceptance functions by an iterative process in the symmetric case where m = n and R = 1: In the equilbrium of either model, the maximum age of an acceptable partner is decreasing in the age of the searcher. Our results relate to discussions in the literature regarding optimal parental age di¤erences, age-related mate preferences, and to mate choice in general. We believe our model will be used as a tool in future investigations in these areas.
This paper is a part of an exploratory study with the goal of investigating the applicability of ... more This paper is a part of an exploratory study with the goal of investigating the applicability of collaboratively-developed enterprise resource planning (the CD-ERP approach) within Libyan public universities. Since it is being proposed in order to overcome the topical issue of information system (IS) development in Libyan higher education (LHE), Libyan universities were investigated to assess IS performance while using the approach of methodological assessment. Accordingly, three public universities were chosen to be studied, namely the University of Tripoli (UOT), Misurata University (MU), and Sirte University (SU). The UOT was run as an initial study to identify practical problems in conducting a formal study. Previous papers have discussed the use of a formal study, in which a methodological assessment of IS performance at Libyan universities was conducted. The findings from all three cases are discussed and analyzed on the basis of selected techniques and models. This analysis i...
The quality of a chosen partner can be one of the most significant factors affecting an animal's ... more The quality of a chosen partner can be one of the most significant factors affecting an animal's long-term reproductive success. We investigate optimal mate choice rules in an environment where there is both local variation in the quality of potential mates within each local mating pool and spatial (or temporal) variation in the average quality of the pools themselves. In such a situation, a robust rule that works well across a variety of environments will confer a significant reproductive advantage. We formulate a full Bayesian model for updating information in such a varying environment and derive the form of the rule that maximizes expected reward in a spatially varying environment. We compare the theoretical performance of our optimal learning rule against both fixed threshold rules and simpler near-optimal learning rules and show that learning is most advantageous when both the local and environmental variances are large. We consider how optimal simple learning rules might evolve and compare their evolution with that of fixed threshold rules using genetic algorithms as minimal models of the relevant genetics. Our analysis points up the variety of ways in which a near-optimal rule can be expressed. Finally, we describe how our results extend to the case of temporally varying environments.
The first article describing this project presented the three games that the participants played:... more The first article describing this project presented the three games that the participants played: the Ultimatum Game, the Trust Game and the Public Goods Game. This article describes the study group on the basis of a questionnaire regarding where they study and come from, their social contacts, interest in current issues, views on inequality and outlook on life. A description of the migratory decisions of students is given. In particular, two exploratory methods are used to investigate the data’s structure: Bayesian networks and principal component analysis. Bayesian networks are used to illustrate the associations between categorical variables. Principal component analysis is designed to describe latent variables which reflect the associations between numerical variables. We present the results of this analysis and discuss the advantages and disadvantages of these two methods.
Prace Naukowe Uniwersytetu Ekonomicznego we Wrocławiu, 2017
Streszczenie: Artykuł prezentuje wyniki badań nad kapitałem społecznym w ujęciu sieciowym oraz no... more Streszczenie: Artykuł prezentuje wyniki badań nad kapitałem społecznym w ujęciu sieciowym oraz normatywnym. Porównano w nim sieci relacji formalnych i nieformalnych ze współpracą reprezentowaną przez poszczególne kategorie osób zaangażowanych w różne rodzaje powiązań. Celem artykułu jest weryfikacja hipotezy, zgodnie z którą rozwiniętym sieciom relacji towarzyszy wyższy kapitał społeczny (której atrybutem jest analizowana w publikacji współpraca) oraz hipotezy mówiącej o tym, że sieciom relacji charakterystycznych dla kapitału wiążącego towarzyszy niższy stopień współpracy niż sieciom relacji charakterystycznych dla kapitału pomostowego. W pracy poziom zaufania analizowano na podstawie wyników badań eksperymentalnych oraz badań ankietowych przeprowadzonych na próbie 1540 osób.
Abstract: We consider the optimal pooling of DNA to detect single nucleotide polymorphisms (SNPs)... more Abstract: We consider the optimal pooling of DNA to detect single nucleotide polymorphisms (SNPs), sites along the genome at which a population shows vari-ation. The focus is on the detection of low frequency variants. Pooling individuals increases the probability that a rare variant appears in the sample. However, as the pool size increases, the mean number of reads from an individual decreases, making it harder to distinguish reads of a rare variant from errors. A hypothesis test for the detection of SNPs is defined. On the basis of this test, we deter-mine the asymptotically optimal pool size given the parameters of the genome sequencer used, the number of lanes available and a specified significance level.
This paper examines the applicability of agile practice in the Collaboratively-Developed Enterpri... more This paper examines the applicability of agile practice in the Collaboratively-Developed Enterprise Resource Planning (CD-ERP) Model. This model has been proposed as a solution to develop Information Systems (ISs) for public universities in Libyan Higher Education (LHE) following the community-source paradigm and based on ERP. The study took place between 2016 and 2020. The purpose of the article is to discuss the possible impact and success of implementing agile practice in such an environment, while a hybrid approach involving agile practice and a predictive method was introduced. The risks and challenges associated with adopting the CD-ERP model are discussed using a SWOT analysis. Finally, the lessons learnt, recommendations, and directions for future work are presented.
PrZestrZenny wymiar Zróżnicowania kaPitału sPołecZnego w Polsce w świetle badań eksPerymentalnych... more PrZestrZenny wymiar Zróżnicowania kaPitału sPołecZnego w Polsce w świetle badań eksPerymentalnych 1 Streszczenie: Celem artykułu jest przedstawienie zróżnicowania przestrzennego kapitału społecznego w Polsce determinowanego różnicami w rozwoju historycznym (regiony historyczne) oraz w układzie wieś-miasto-metropolia. Wcześniejsze badania wskazują na istnienie takich różnic, jednak opierają się na danych deklaratywnych, mających swoje mankamenty. W pracy zastosowano nową metodę oceny kapitału społecznego-obserwację zachowań badanych osób w eksperymencie teoriogrowym-którą skonfrontowano z badaniami ankietowymi w celu uchwycenia luki intencjonalno-behawioralnej. Badania przeprowadzone na próbie 1540 osób wskazują na niewielkie zróżnicowanie kapitału społecznego pomiędzy zastosowanymi jednostkami podziału przestrzennego, na istnienie różnic pomiędzy tym, co deklarowane, a tym, co obserwowane w kwestii zaufania, wiarygodności oraz współpracy. Wyniki tych badań słabo korelują z wynikami badań wcześniejszych. Słowa kluczowe: kapitał społeczny, luka intencjonalo-behawioralna, ekonomia eksperymentalna, trust game, public good game, uwarunkowania historyczne the sPatial dimension of social caPital differentiation in Poland in light of exPerimental research
An important problem in genetics is detecting single nucleotide polymorphisms (SNPs), sites along... more An important problem in genetics is detecting single nucleotide polymorphisms (SNPs), sites along the genome at which a population shows variation. The focus is on the detection of rare variants. Pooling individuals allows us to increase the probability that a rare variant appears in the sample. However, as the pool size increases, the mean number of reads from an individual decreases, making it harder to distinguish reads of a rare variant from errors. This paper compares three statistical tests for detecting SNPs using data from pooled DNA samples.
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